Any further help?
Jet A1 is a mixture of two hydrocarbon liquids distilled from crude oil. These liquids or "cuts" are kerosene and naphtha. There are slight differences in these cuts depending on the temperatures of the distillation process and the crudes used. The cuts are within a specific range and therfore are not one fixed density. Jet A1 is therefore not a fixed density either but within an allowable range.
In summer Jet A1 is a 50/50 mix of these two liquids and in winter the naphtha proportion is increased by about 5% to allow for the lower temperatures encountered.
If you wish to see the full spec, Goggle ASTM Jet A1 Specification.
In my day we also used to add anti static and an anti icing additives. These are very small amounts and will have little impact on the overall SG.
Sulphur free Jet A1 is normally water white in colour. If there is any water present, which there should not be, the Jet A1 will be a "milky white" colour.
If the Jet A1 is sold as heating oil it is known as paraffin oil. This product has a dye added to it to distinguish it from Aviation quality Jet A1. The dye is usually pink or blue depending on the company selling it. (e.g. In the UK these products were sold as Aladin Pink or Esso Blue paraffin oil.)
Other than the colour paraffin oil is Jet A1.
So including the info in the previous thread, the result is that there is not a simple constant you can apply to temperature to give you density.